A young man finds that every time he eats dairy products he feels very uncomfortable.His stomach becomes distended he develops gas and diarrhea frequently.These symptoms do not appears when he eats foods other than dairy products.Which of the following is the most likely enzyme in which this young man is deficient?

• A. ALFA-glucosidase
• B. Sucrase
• C. ALFA-amylase
• D. BETA-galactosidase